What is the primary indicator of the biological health of a water body?
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A.
Electrical conductivity
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B.
pH
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C.
Dissolved oxygen
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D.
Turbidity
Correct Answer:
C. Dissolved oxygen
Explanation:
Dissolved oxygen is the most reliable indicator of a water body's biological health because it is essential for the survival of aquatic organisms like fish and invertebrates. High levels of dissolved oxygen typically suggest a thriving, well-aerated ecosystem capable of supporting diverse life forms. Conversely, low oxygen levels often signal pollution or excessive organic decay, which can lead to "dead zones" where most aquatic species cannot survive. While factors like pH and turbidity provide environmental context, the availability of oxygen directly dictates the biological productivity and overall vitality of the habitat.
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